**2.2 The chemical components of biogas residue fibre**

Fig.2-2 showed the quality percentage of cellulose, hemi-cellulose, and lignin in biogas residue.

Fig. 2-2. Chemical compositions of biogas residue fibre

According to research results (Gao Zhenghua, 2008; Chen Hongzhang, 2008), the cellulose, hemi-cellulose, lignin of straw, wheat and corn stalks compared with these of biogas residue fibre were shown in table 2-4.


Table 2-4. Chemical composition of biomass

The comparative analysis results showed that, cellulose quality percentage of biogas residue fibre after anaerobic fermentation was 5% higher than straw, wheat stalk, corn stalk; while hemi-cellulose quality percentage was 5%lower than straw, wheat stalk, corn stalk; lignin quality percentage did not change. The result showed that anaerobic fermentation to lignin content was not influence, hemi-cellulose relatively reduced, cellulose relatively increased, it is positive to the resources utilization of biogas residue.

Run

Beating degree SR°

Grammage g/m2

Table 3-2. Experimental plan and results

film samples during degradation period was shown in Fig.3-2

Fig. 3-1. The arrangement of the degradation period test

**3.1 Degradation period test** 

Rosin %

Study on Manufacturing Technology and Performance of Biogas Residue Film 275

Bauxite %

 x1 x2 x3 x4 x5 y1*i* y2*i* y3*<sup>i</sup>* 20 40 110 0.8 4 1.8 40.5 19.5 37.0 21 40 80 0.4 4 1.8 33.8 16.4 29.4 22 40 80 1.2 4 1.8 26.4 12.6 30.6 23 40 80 0.8 2 1.8 25.9 11.4 31.1 24 40 80 0.8 6 1.8 26.9 11.1 32.5 25 40 80 0.8 4 0.6 22.1 8.7 26.4 26 40 80 0.8 4 3 26.6 15.5 37.2 27 40 80 0.8 4 1.8 28.0 13.4 32.8 28 40 80 0.8 4 1.8 32.3 13.3 33.4 29 40 80 0.8 4 1.8 29.6 12.7 33.2 30 40 80 0.8 4 1.8 30.6 13.8 31.6 31 40 80 0.8 4 1.8 28.8 11.8 33.6 32 40 80 0.8 4 1.8 27.6 12.3 36.8 33 40 80 0.8 4 1.8 31.1 14.5 36.7 34 40 80 0.8 4 1.8 33.2 14.9 35.1 35 40 80 0.8 4 1.8 31.8 14.4 34.6 36 40 80 0.8 4 1.8 30.7 14.7 41.1

The arrangement of the degradation period test was shown in Fig.3-1. Degradation state of

Factors Response functions

Dry tensile strength N

Wet tensile strength N

Degradation period day

Wet strength agent %
